Add directory contents printing to cibuildwheel

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -78,6 +78,9 @@ jobs:
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux1
           CIBW_ENVIRONMENT_LINUX: SETUPTOOLS_DSO_PLAT_NAME=manylinux1_x86_64
           CIBW_SKIP: "*-musllinux*" # epicscorelibs doesn't build on musllinux platforms
+          # Some debugging variables to work out why subfolder not on Windows
+          CIBW_BEFORE_ALL_WINDOWS: tree /F
+          CIBW_BEFORE_ALL_LINUX: tree
 
       - name: Upload Wheel and Sdist
         uses: actions/upload-artifact@v2